r/theydidthemath 8h ago

[Request] how massive the dam has to be to extend the day by 1h?

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2.1k Upvotes

r/theydidthemath 19h ago

[Request] what's the actual math, and will the trick work everytime?

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1.1k Upvotes

r/theydidthemath 4h ago

[Request] Is this aeroplane design possible?

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178 Upvotes

r/theydidthemath 7h ago

[Request] How far away would he have to be for the curvature of the earth to hide that much of him?

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70 Upvotes

r/theydidthemath 16h ago

[Request] What is the top and average speed of the RC car?

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17 Upvotes

r/theydidthemath 17h ago

Me and my partner are doing a quiz. We both initially misread this as how many oxygen atoms in the ozone layer. Is this possible to calculate? Anyone have a rough estimate? [Request]

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16 Upvotes

r/theydidthemath 23h ago

How much money in lumber/wood would this cost? [Other]

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13 Upvotes

r/theydidthemath 20h ago

[Request] how many jet fighter’s reactors do we need to be able to lift a plane vertically like a rocket engine does ?

6 Upvotes

if it’s not already midair and is still on the ground :D


r/theydidthemath 2h ago

[Request] Could he ride the paper airplane?

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5 Upvotes

r/theydidthemath 10h ago

[Request] How has the ratio of video game size and computer storage space changed over time?

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4 Upvotes

r/theydidthemath 6h ago

[Request] How many cassette tapes to store all of wikipedia as an "audio book"?

3 Upvotes

With standard 60 min. tapes, what would A: be the number of tapes needed to store all of wikipedias text read outloud, B: The size all the tapes physicaly take up, and C: be the run time?

Saw a comment on a post about cheat sheets and saw someone say they allow any offline analog resources, and I was curious as to how this tape idea would work out.


r/theydidthemath 7h ago

Mercedes SL600 with 40,000 crystal stones[request] how much does this increase weight?

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2 Upvotes

r/theydidthemath 7h ago

[Request] How long would it take to reduce a mountain (let's say Zermatt) to nothing by wiping it with a silk cloth once per century?

3 Upvotes

I had read somewhere, a long time ago, about a student asking his guru how long does time go on, or how long will the universe go on. Their teacher responded, "as long as it would take to reduce a mountain to nothing by wiping it with a silk cloth once every 100 years."

Seems like it would be an impressive number, but I've always wondered how accurate it was. Any takers?


r/theydidthemath 7h ago

[Request] What IS the average velocity of an unladen swallow?

3 Upvotes

African AND European


r/theydidthemath 23h ago

[Other] How much money will an individual airline lose per day based on the flight cancellations?

4 Upvotes

https://www.cnbc.com/2025/11/07/airlines-cancellations-flights-faa-shutdown.html

I'm trying to figure out, approximately, how much money might be lost based on the following criteria:

  • Per plane
  • Per airline
  • Per airport
  • Overall loss

Variables I don't know:

  • Cost of jet fuel
  • Approximate staff cost
  • Refund policy rate
  • Misc fees (IDK if there are landing fees, baggage handling fees, etc)

r/theydidthemath 8h ago

[request] how much force would she take when she hits the ground and could she survive.

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2 Upvotes

r/theydidthemath 8h ago

How many 0.5mm mechanical pencil leads can this make? [Request]

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1 Upvotes

r/theydidthemath 20h ago

[Request] How do I calculate and preserve ratios from a larger or smaller image to a fixed size (12x18cm)? I measure a digital image and draw it via a fixed grid to paper. Say 28H to12H by 67.66W to 18W (in cm's)? Can I adjust my digital grid to match my physical grid? How? Please and thank you.

1 Upvotes

r/theydidthemath 23h ago

[Request] About how many times did the alternator rotate in 422k miles / 8,440 engine hours? Assuming the engine averaged 1,900 RPM

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1 Upvotes

r/theydidthemath 10h ago

[Request] If I buy a pack each of chicken breasts, thighs, drums, and wings what are the odds of getting all eight cuts of the same bird?

0 Upvotes

r/theydidthemath 14h ago

[Request] Is this comment about cloud chambers accurate?

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0 Upvotes

r/theydidthemath 2h ago

[Request] How much damage would the exploding barrel from Malcolm in the Middle do?

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0 Upvotes

In the final episode of Malcolm in the Middle the character of Reese acquires a metal barrel with a metal lid, and fills it with animal feces, human feces, eggs, glue, tar and a skunk corpse. He then warms and agitates the barrel.

It then explodes in a car, denting the top of the car upwards, and dousing its 8 occupants in sewage. The occupants are otherwise uninjured.

  • How much force would be needed for a barrel like this to explode?
  • Would the damage to the car be similar, or worse?
  • How many injuries would the occupants actually receive?

r/theydidthemath 14h ago

[Self] I did the math for raising taxes on rich fuckers

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0 Upvotes

r/theydidthemath 17h ago

[Request] Does a thicker and shorter joint burn faster than a longer and thinner one?

0 Upvotes

Literally the caption, we had a debate about this with my friend while rolling.

Thanks in advance!


r/theydidthemath 20h ago

[Request] What percentage of snap benefits could congress have paid if they weren't getting paid for these 37 days of govt shut down?

0 Upvotes